<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>设置文字加粗</title>
    <!--这个例子演示了如何设置字体的加粗。-->
    <style>
        p.normal {font-weight: normal;}
        p.light {font-weight: lighter;}
        p.thick {font-weight: bold;}
        p.thicker {font-weight: 900;}
    </style>
</head>
<body>
<p class="normal">This is a paragraph.</p>
<p class="light">This is a paragraph.</p>
<p class="thick">This is a paragraph.</p>
<p class="thicker">This is a paragraph.</p>
</body>
</html>